H3C Technologies H3C S7500E Series Switches - Manual (Page 138)

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Cable pinouts
EIA/TIA cabling specifications define two standards: 568A and 568B for cable pinouts.
• Standard 568A—Pin 1: white/green stripe, pin 2: green solid, pin 3: white/orange stripe, pin 4:
blue solid, pin 5: white/blue stripe, pin 6: orange solid, pin 7: white/brown stripe, pin 8: brown
solid.
• Standard 568B—Pin 1: white/orange stripe, pin 2: orange solid, pin 3: white/green stripe, pin 4:
blue solid, pin 5: white/blue stripe, pin 6: green solid, pin 7: white/brown stripe, pin 8: brown
solid.
Cable type
Based on performance
Ethernet cables can be classified into category 3, category 4, category 5, category 5e, category 6, and
category 7 cable based on performance. In LANs, category 5, category 5e, and category 6 are
commonly used.
Table 81 Ethernet cable description
Type Description
Category 5 Transmits data at a maximum speed of 100 Mbps, with a bandwidth of 100 MHz.
Category 5e Transmits data at a maximum speed of 1000 Mbps, with a bandwidth of 100 MHz.
Category 6 Transmits data at a maximum speed of 10 Gbps, with a bandwidth of 250 MHz.
NOTE:
The RJ-45 Ethernet ports use category 5 or higher Ethernet twisted pair cables for connection.
Based on pinouts
Ethernet twisted pair cables can be classified into straight through and crossover cables based on their
pinouts.
• Straight-through—The pinouts at both ends comply with standard 568B, as shown in Figure 74 .
• Crossover—The pinouts at one end comply with standard 568B, and those at the other end comply
with standard 568A, as shown in
Figure 75 .